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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c083e4e67a6c8f4e2892998072044be0b2c69ac38c2278dec777c5286a607e8' 
  AND token = 'hp3k64lqBxoVR+9R9KnsBWfHs/zij5HXD5mdcpG1FH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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