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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaec714b903d9e9b51dca50ad3705ea9f5e28f9848005fa65f445ca1a417d23' 
  AND token = 'VG9fHYS7hDAThq7J5VHCuMuD5O0lP5GdvmC7pfSNkhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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