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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101e10cde67df8bf2a581bf7723d072a28a685a3fbb188bb492a1248017435a7' 
  AND token = 'FNXgzqIbsA9+D3Htoh87gpTgMwWRy6npI1CcA/jGtVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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