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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09486a3dff789082af7048975fbcf600ad996ee50240f7c101e99aec254ff05e' 
  AND token = 'RdZcRl0f02898ragkfIpRPAVC65QkdsaFNqWkbx2kJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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