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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1442008c015af536934cc27ce2f05fdd3aca275023efbb467536552587792a55' 
  AND token = 'k/QAu0LVj7mUzbQSEp9M9TrVs5+wb/Hk28EHZH1kamw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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