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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff442ae9be25f2536106b4da800c27b7ab1ff0ea6eec5dfb0adae847f0e52a13' 
  AND token = 'praEt8MNTE0AXModE/Vffgy5sAEHQhtk3VEwxfcwHRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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