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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f916d0712829f70fc9f7b5b43d4f745a11442eb56f533f4e057319b2924c09af' 
  AND token = 'wwmh1tSDWDTET4qzTTt5DtW8ci0XOEXz0qKO8AxkhL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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