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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d2e1867febefc55c8eade5e02f1b766bdb31220f29f74532d8383c4f351bf0' 
  AND token = 'zB0/NtPWxeovHzEs5kYhAbtUpi1XmmzN0G9tYc2vqKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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