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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd360ee685af1127e01ed8d5589f2a40b7244509835af3cd0127638c78be49b6' 
  AND token = 'fjVPxXCOscY6T9W+N5TdNCMhc1Hx1JFut4ZXZUZCf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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