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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c2bb7e2a03838f59b81ff54c666b8d37739b54288a8f7398d7624717092fa9' 
  AND token = 'SnSxfXbQ6tP4WZHl8evycykDjVGOYluskhgPc1L2HCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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