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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca192ab5cac0f0cbc7a9ae141840847417d0286106fb650c402692064664cee' 
  AND token = 'qHviQfnU6HF0gjuCQWzs27irumfgClCt7papEeDQwYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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