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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e136963547b53034b05dfc5b4fbf7bcb5ee205a2c2edd103f8ddbcc219741b' 
  AND token = 'Vz0BRXydDu7xOk6+ASt5LYebJ5CmrAot9DxCOAvjRzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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