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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca74761b63cd558038414fd0ff06cb3ef1b5c3cde4cbc2fd6b0d198550d3dc2' 
  AND token = 'hA8JG45XIb38tJcVmEgdUutcr4d5IJyLXZBEwFTRTD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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