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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dc0e4e8181d66ec1dfbe4787f85753a975900d5806baa6b5866d3b5e212d0b' 
  AND token = '+/ILK+248cQsxBoKPNFLUyGLra52717qxoBOycJdSzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}