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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4138bacf0492df94c1ef86e2697a92c2f30665c29000bb94feee20e81026c5f2' 
  AND token = 'TLTQsUXXH/VRwC2knu3Uu6GIImd1kYEHGm2wfWCT86k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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