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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6a25508a21b8e7e87c54cafb1411d7b633d7da63c3165c338252eacc343b4e' 
  AND token = 'jlZAwPArIaAZXHt2UZNviLQDkPpZ8L5aXetGDLADoeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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