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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3970cef6adc477c02b2ce39782b49747e8a875958cb140544aa43186e2a18b' 
  AND token = 'AJULtodynRvF2XGJ1wqEcVgmGXQZQkvkuA2EyoL67oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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