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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f77d0acec90a6fbb026b3515ed98ad98e908e1609ec91dbee77212fb0936f2' 
  AND token = 'Bt3S880TA5n73aAqHLlJvNdArAJNrmM9x40z1tk3gt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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