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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0553374999e19552869acb95808756cef3da66cf92822277f325e457fd7f2a' 
  AND token = 'mdGjtVC+D8ytnqOg5554I0Um68VCABmIY7tXHBS9J60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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