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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c406462d79f48eeb937b6796165b582cf1c7467280cd84dccb6e0e6036c1bd1' 
  AND token = 'c93mFo/q4HyUHbEKo6f3cQ5rKva9ZT6XCcdmVigxlkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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