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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6e35731e0dafdcd9a85db22667a81022763b72f28607a9f572ba952951b558' 
  AND token = 'seE2UTYSepZV+fPF5oJIKf8pVZjyH8geQd3zBXjphnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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