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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213d09dc1f5ec52bc3091c71286a53722345011f951731832aafdac48f30ed36' 
  AND token = 'yEFzDbJmhlZ5Oo8S9fIaHbRPaXhdGMjglVm7A/eIwCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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