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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7aff8688c01f09ebf445b277f3e414f231c40d3554a12dfa9616cec47b1ddc' 
  AND token = '6JajfUNcEbfKaC3psTt2wi2fc2sJEaN214iN/Hk+Cpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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