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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bc93c4465212a11f7c62de1b2faf9300f2e5d653fbd393cf1c0230fd2d7f89' 
  AND token = 'kXv4lAcz2D1Qcpv5PJ8b119vwXUKysZvUK56q+Qjzz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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