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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1e1032b686213f0d26b9064d5eda894e4975abdf7a51ec6d9234b275c94adc' 
  AND token = 'u2cnpMPKaaVti/599Hol1TOd6EdiGbIAEB1xeL3xM30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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