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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1767db50dabde37c21af0c239bc521a5ac7134ddd273b5bba41ddf154242b3' 
  AND token = 'MSwruCyDinDplEiiGjq/kFCAuMhYt8DIc1kFC//myK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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