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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937c4f3f9fff5ac7fb35c53e81270b57dcbe3302413a3871024d28bc38b5ce3c' 
  AND token = '7yElnxYC8diU1kkCf13zLlXfTfF6gYGEuEWAsJoLlpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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