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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8b3ddc738b24e02770fbee3f090087bb9d11d4b5255c1362fe0153f83f8df7' 
  AND token = 'C4NpcCHkDp5ayikGTXBWWW3BKQA14lWv9QmtY/EcBd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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