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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87f9caa0c140b52a50462ccc252c7446efb694f823adee76f415e2eb87a1c74' 
  AND token = 'lPY1i2rOtEw9uR79wKiSFS9uHdo6tCfP+GiV+fjyAw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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