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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0de31f0579ec60877eb9d77daa49c10f928dd89ab006b54102dcebf76258e45' 
  AND token = 'Bioe2wVNvcVfBP9b+3v4OZH/k0iM275xvSB4/4XQsfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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