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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b86b54286215a4f27e24741b2d9f976a1383d895ea520baaf44fe05d56f6ee1' 
  AND token = 'CoWMqhqfEx0fmtW/i8jynthlH0VZ4JEYJ1c383Is1x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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