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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb763ed9d4bb9a30541c80458a024a647bfccf9dc0451a8ec1079cdf03084eb9' 
  AND token = 'JbvfCzbdurN2nJq0WQMabHgtw6443v+4+DTrEuii4+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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