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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9aca7df06668380f8cc3af7aea9ce8000fb21c293253667f93c7b1dbdd576cc' 
  AND token = '19RMGlL1qT/WMgEBebcHUFJQ20lL+fufDNpp8mVHRBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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