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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712df39f815bfcf83b118805e727d74ec9b9cc71b10e8c306e026493739297cb' 
  AND token = 'Vol6pMg71B2GowvjYTMYkW1T8QY68vIOKX7wuS+1hnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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