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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713c1b211ef1badf84db1499427b7d70f191c1415ee28141c19017ca2fd0ae9b' 
  AND token = '+mSGEcBmzITxK/0XzK6pbN5oLcNtkfZ7mb87WakQ4ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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