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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52704eae70e411ca39bde265c971af84af6c9e6fbc63ad48618a87ec95d1971' 
  AND token = 'euhbqeoJthrnuJyitl4ZgUgD6ea4/TFr963ZMfuCv40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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