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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b2222de6e3fcd0c2e6bc19e943a6985603cbe52ff5caccce5093f7559411ef' 
  AND token = 'erR583eBDh/WfHgm7dNDP1aCZnLpZQ1tKEiK2vyKr2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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