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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039991b57666323854f12c89fcc5f1bd817bfc1d366719533d9d36801430ebf5' 
  AND token = 'wYQmnEPNJJkSYerjexWGLHV47zJ9iVR66atl6Sk12LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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