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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c58966f53f3d28e4c338ec520c217e9c2fc16da1e87dafab3c5948cf56b8d64' 
  AND token = 'OceVzpeCXwe8dppLsI4veKjHM5VHpwmgLQaTC05fQA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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