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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4a63969998b7d6bde6f89936c192ae3b9c8aeac1f9895d7e26afdd4397619e' 
  AND token = 'UBHs6XKCveSX+aVOcYgFeeG5yJr10QvMAJ9pfsSzyas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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