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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cc4d73d90d85e215c5a3f5e40ed28709fdfd3dbf041d02f5e1759bcb19f9b7' 
  AND token = 'z/BQwHBLbTSJCGR13M06MGTkgZ3ar8B8HQ/oKwWEjH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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