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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e7320fad0b9681ad9966f26c0ab20b0b67d69ff2054a4509066a5b66411c13' 
  AND token = 'GBu5qIOfcOERvOt/dxUloDDxy6DahYraRAIxFXmeE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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