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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5407ad9b145369bcb9808e28545b87e4bc2844c5fcfa160f2e2a86199e76b94' 
  AND token = 'PhTGdiYgxQFc/utParfJOFiHR0QXkvflXJWf041Qt+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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