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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9b928c135b54e17fdeb7bad51da4be4c279dfb7daf80127f8bc3c4cf5048c6' 
  AND token = '2SbrQovJgNd9j48Ve7S5Q8l11vjFdXmR8uLcXxrovwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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