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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4718c6067b00b21a88d53c44718f76655c3ffe8c230f83e34ffdc6c37114fea' 
  AND token = 'dZs7OIfqh930DSigcQMuZ2/79huW2gpIeFK6+aJFv28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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