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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa4cb2f582c0b95bba7fb479b963a31525018fb8015bef5a895d6e396352180' 
  AND token = '1g9ga3lLc1sZ3eOZr3RVhfU4ZHGkJapdfYeVzK98JN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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