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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12c82fb690f95dcf341db8de7ef0a5630762a1aacdb3030ec745d80420cecca' 
  AND token = 'WHypot49dsRK8NieGOgML9y29VBxLdB+lLWLX2Y3/qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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