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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a44b5f5f20ee6932cc9ed7a1f60163a98004fafc2693c5b4347c62fe61fa3c' 
  AND token = 'pD83nVvMOD7j3hK2iErMkXkw2+0uE+9eTsCDzmzKYic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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