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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0c108db6be681fb941f1b13cad8cd7776df08ff2f7f08c431c75fd80ad950c' 
  AND token = '03OX0o4wzLIpkVIZMXa9n33jA0a2mpMpVGtNJ3DzJwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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