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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb9cdaa9195bb66b0ddb43155de9e92ffd5a0d0b7fad892350d162e070200c3' 
  AND token = 'zxW6HU7P9AsI+UO6HCfxJ9BIif7u5FDFvPD+pX47JRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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