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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60f6675b2c590319bb59a779b72837e916ff9d8d961b4a2e93fab2334c5197d' 
  AND token = 'p3vB8h6cn11Dsp311OJhNWMBVhxPyRrnpy7f2BWkmV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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