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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07ec634b0548d8b5da4eca0b135f5eaaa3feee67aad5c251a0c09626a6e9bb3' 
  AND token = 'CAGWTJ9inYknW1t9KZO9KP3o3Lb3MU/oaYbB7Fp007Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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