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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855302f8f1a3ed9dd1d687b79eeb8c06418061b9a7d503f1700f3634de8035a0' 
  AND token = '4TFeGCkt5yjMXYffkG4wGQhbF4hKExPIX+meWHezaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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