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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5cdfc988b4e7439e3367473abe224276fb8e131a7e716ca5b6155f894670a4' 
  AND token = 'u7isghe27wYENYiu8OKN5E+O01RqfE3ZV5858hYars0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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