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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4f035b427807e5c401e2ba22c8292c37a404ae4bb4ea35c188536bc09d95e9' 
  AND token = 'uBGsox4BGUZYGR0ZNeeUwraf+c7ZUfG7IhrzhnoJi6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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