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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098aef52590befde2d6cf54a841d805ff68db18ade4e7e6dc2b5627009511047' 
  AND token = 'I2O1S1pxr+Z3xQsDB3OAj6fFJyy3q3jlBSs1uBjOOlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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