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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a1a1f1a80e0bc9efebbe6a8babc28bf3cfabd9ce2c22a7264bfa935163150e' 
  AND token = 'qJ8PNo0g2Te7ZQH4Z+r+h6WvT6HsBpE65KFkODTDQ6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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