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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf0ce08142edd6caaa6403affaf998653c32153c0b07db0af42c7fe3e2c6011' 
  AND token = 'zl67gEvcuRAge4B4z+lT2tiBKy8P25Wja+t4ng+MMIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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