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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8786212f4cc6867ee1b368d40ad53b051365068e8a589f40fc21484915cdc3b5' 
  AND token = 'SQE4wccol+ghFt3xie1bIf4ie0nPCYVFa4Ou11fqhf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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